The two best friends are headed to Yosemite National Park in California to help out park ranger Shelton Johnson. Shelton wrote to Oprah because he's concerned by the low number of African-Americans who visit the national parks each year. Out of the 280 million tourists who come, just 1 percent are African-American.

"So Gayle and I, being African-American, hopped in our Chevy, packed up our camper and paid him a surprise visit," Oprah says.